docs: changelog for 0.1.5

Author: matheusdavidson

CHANGELOG.md

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+## 0.1.5 (2017-09-15)
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+### Features
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+* **checkCrossOrigin:** make crossorigin optional ([#1](https://github.com/matheusdavidson/angular-cropperjs/issues/1)) ([b34b696](https://github.com/matheusdavidson/angular-cropperjs/commit/b34b6964c826186845bd29f42460c657851ddc94), closes [#1]
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